The merge works pretty well and doesn't take over long if you don't have over 30 files or so. Then you can split them where they ought to be.
My problem with the merge is to make sure I do it consistently so things merge in the right order and so that there isn't unintentional overwriting. After the 20th merge I am inclined to get a little rummy. That is a reason for a backup before which I always advocate but don't always remember to do if I have been at it for HOURS.
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